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Predict which of the following will be coloured in aqueous solution? Ti^3+, V^3+, Cu^+, Sc^3+, Mn^2+, Fe^3+ and CO^2+ and MnO^4-.

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Predict which of the following will be coloured in aqueous solution?

Ti3+, V3+, Cu+, Sc3+, Mn2+, Fe3+ and CO2+ and MnO4-. Give reasons for each.

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Any ion that has partially filled d-orbitals is coloured due to d-d transition in visible light. Ti3+(d1),V3+(d2) Mn2+(d5),Co2+(d8) are coloured. MnO4- has purpule colour due to charge-transfer. Cu+(d10) and Sc3+(d0) are white since there is no d-d transition.

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